Mixer



J. JOHNSON.

l MIXER. APPLICATION FILED IIINE I, I9I6. RENEwED FEB. 21, I9I9.y

1,354,489. Y v Patented Oct. 5, 1920.

3 SHEETS-SHEET 1.

Ii EMM@ N @I J. JOHNSON.

MIXER. -APPLlcATloN FILED JUNE 7. 191e. 1,354,489.

RENEWED FEB. 21,1919.

Patented Oct. 5, 1920.

J. JOHNSON.

A MIXER. APPLICATION FILED JUNE 7, i916. RENEWED FEB. 21, 1919.

3 SHEETS-SHEET 3.

' K l vwemfoz Mdnwm ment of the liquid l effect, tending to UNITED STATES PATENToFFlcE.

JOHN JOHNSON, 0F BROOKLYN,' NEW YORK.

. MIXER.

Application filed .rune 7, 191e, serial No. 102,110.

To a?? whom it may concern.'

Be it known that I, JOHN JOHNSON, a citizen of the United States, residing at Brooklyn, New York, have invented certain new and useful Improvements in Mixers, of which the following is a clear, full, and exact description.

his invention relates to mixers, and particularly to rotary-mixers for use in mixing solids, liquids or gases with liquids.

Rotary mixers as hitherto .constructed have usually tended in operation to impart to the contents of the mixing tank a whirl- `ing motion about the axis of rotation, this whirling motion, with its resultant eddying interfere with those movements of the liquid across the axis of rotat-ion and lengthwise thereof which are necessary for the complete intermingling of the materials to be mixed. Moreover, in the operation of rotary mixers or mixing wheels of the tangential type, the centrifugal flow of the liquid through the wheel tends also to create an eddy in the stream entering the central part of the wheel, and this eddying movement of course reduces the stream to the wheel and'consequent-ly the mixing action of the wheel.

An object of the invention is to/prov'ide simple and efficient mixing means which will obviate the difficulties heretofore experienced in mixing operations, and will insure an effective intermixing of the contents of the mixing tank.

More particularly the invention aims to provide improved mixing means of the rotary type which will operate to insure moveacross the axis of rotation, as well as lengthwise thereof. and at the same time will check any tendency to bodily whirling of the tank contents vabout the axis of rotation.

An important feature of the invention is the arrangement in the stream to the centrifugal wheel, of means for imposing upon the stream a centripetal tendency.

Another important feature of the invention is the provision of means about the periphery of the rotary mixing or tangential wheel for converting the tangentlal move- 'ment of the discharged material into substantially a -radial movement.

The invention also contemplates the provision in rotary mixing means of the centrifu al type. of means for causing some or all ofg the material entering upon one side of Specification of Letters Patent.

Patented Oct. 5, 1920. Renewed February 221, 1919. Serial No. 278,509.

`ing description and claims when considered 1n connection with the in s, in whichigure 1 is a vertical elevation of the mixing device, the tank in which the device is located being shown in section;

Fig. 2 is a plan view of the mixing mechan'ism proper; i i

Fig. 3 is a view of a modi-fied mixing wheel arranged to -be located between the top and the bottom of the mixing tank;

Fig. 4 is a plan View of the mixing wheel shown in Fig. 3; "v

Fig. 5 is a vertical section through the mixing means shown in Figs.. 1 and 2;

F ig."6 is a vertical section through the mixing wheel shown in Figs. 3 and 4; and

Fig. 7 is a modification of the typeof mixwheel shown in Figs. 3, 4 and 6.

n the form of the` invention shown in Figs.' l, 2 and 5 of the drawings. which is intended for use in the -bottom of a mixing accompanying drawtank, the material to be operated'upon by the mixing wheel preferably enters the top of the wheel 2 through the opening 4, and is directed toward the periphery of the wheel by turbineblades 6 which create a centrifugal flow of the liquid. From an inspection of Fig. 2 of the drawings it will be noted that these blades are inclined away from the direction of rotation of the wheel 2.

The centrifugalv flow of the materials to be mixed created by the action of the blades 6 tends to' draw the stream of materials entering the opening 4 toward the inside of the cylindrical wall 8 surrounding this opening, and this action, together with the turning action of the wheel. tends to create a whirling motion of the liqui/d above the wheel and thus tends to create an eddy in the stream entering the opening 4. To counteract this tendency. I provide blades l() which are inclined toward the direction of turning of the wheel. as shown in Fig. 5, this inclination increasing from the hub 12 of the wheel toward the periphery, whereby these blades tend to direct the stream entering the opening 4 toward the center of rotation; in other words, they create a centripetal tendency in l the blades 6.

A materials and a proper Fig. 2 of the drawings.

. its lower sides,

In the illustrated construction, the wheel 2 comprises a horizontal plate 14 upon the underside of which the blades 6 are carried, these blades being preferably cast integral with the' plate 14, and the cylindrical wall 8 surrounding the opening 4 is preferably carried upon the plate 14, the blades 10 being also preferably for the most part above this late and extending between the hub 12 of the wheel and the cylindrical wall 8. These parts may all be cast in one integral piece;

As the mixed materials are discharged from the periphery of the wheel 2, they tend to travel in tangential paths and horizontally across th`e bottom of the tank 16, and then to flow up the sides of the `tank to a position above the wheel to replace the material drawn into thecenter of the wheel. The tendency of the wheel is gradually to setup a whirling motion of the entire contents of the tank in the same direction as the rotation of the wheel.l This whirling motion with its accompanying eddying effect tends to` counteract the mixing action of the wheel and tok throw the tank contents, by centrifugal action, to the outer wall of the tank out of the range of operation of the wheel. To counteract this tendency and insure a positive mixing of the directionof the mixing currents, baille plates 18 are provided which are preferably so located about the periphery of the wheel 2 and at such angles to theI periphery that they intersect the tangentially discharged material and tend to direct it ,along radial lines, as shown in These baiiie plates ymay conveniently be formed upon segmental plates 20 which can be attached by screws 22 to the bottom of the tank, six of these baille-carrying segment plates being shown in Fig. 2 of the drawing.

In the modification of the invention shown in Fig. 3 of the drawings, the mixing -wheel is constructe for use at a point between thetop and the bottom of the tank, and is designed to insure a mixing of the materials above the wheel with the materials below the wheel. In this construction, the wheelhas material -r receiving openings 24 and 26 at both its upper and and the blades 28 which produce the centrifugal flow of the materials are carried by a central disk 30, integral with the hub 32 of the wheel. These blades, like the blades of the wheel shown in Figs. 1, 2 and 5, are inclined away from the direction of rotation so as to insure the centrifugal ow of the materials to be mixed. and 'the materials are confined and guided as they fiow toward the periphery of the wheel by upper and lower plates 34 and 36, which are inclined toward each other as they approach the periphery. From an inspection of Fig. 3 of the drawings, ,it will be seen' that the materials are drawn into the openings 24 and 26 from above and below the wheel respectively, by the centrifugal iiow created .by the blades 28. In order to insure the proper mixing of the materials without a bodily`whirling motion of the tank contents, baille plates 38 and 40 are preferably provided about the periphery of the wheel, these plates being inclined to the periphery in the same manner as the plates 18 shown in Fig. 2, and in order that part of the stream of discharged materialmay be directed-toward the bottom of the tank and part toward the top, these baiiie plates 38 and 40 are formed respectively upon the upper and lower sides of a separating plate 42 which surrounds the mixing wheel at its middle.

lt will be noted that the streams which enter the upper and lower openings 24 and 26 are discharged from common discharge openings. In other words, the two streams minglein the wheel, and in order that a part of these mingled streams may be disv'charged toward the top of the tank and another part towardthe bottom, the plates 34 and 36 are preferably so formed that successive discharge openings direct the greater part of the flow in opposite directions. As shown in Figs. 4 and 6 of the drawings, the discharge opening between two successive blades 28 is enlarged by ha'ving `the upper plate cut back, as shownat 44 in Fig. 6,/ while the discharge opening between the succeeding blades 28 is enlarged by having the lower plate cut back, as shown at 46 in Fig. 4. Thus the material dischargedbetween two of the blades 28, whichl consists of 'a mixture of the material entering the upper and lower'openings 24 and 26, will be discharged with a tendency to iiow above the separating plate 42, while the material discharged between the succeedingblades 28, likewise consisting of a mixture of the materials entering the openings 24 and 26, will be discharged with a tendencyto'flowbelow the plate 42.

In the modification shown in Fig. 7, this separating and distributing action is obtained by making the separating plate which connects the batiies 38 and 40 in the form of alternately upwardly and downwardly directed sections 48 and 50, as shown in Fig. 7. In this construction, the upper and lower plates 34 and 36 of the mixing wheel will extend equally to the periphery about the whole circumference of the wheel.

Any suitable mechanism may be provided for driving the mixing wheel. The mechanism shown in Fig. 1 comprises a Vertical shaft 52 upon the lower end of which the wheel` isl carried, this shaft being supportl ed in a bearing 54, in a bracket 56 carried upon cross pieces 58 extending across the top of the tank, and having upon lts upper end a bevel gear 60 with which ymeshes a bevel pinion 62 upon-"a cross shaft 64 -provided with loose and fast pulleys 66 and 68.

As shown in Fig. 3 'of the drawings, the baffles 38 and 40 and the separating plate 42 may be attached to the side walls of the tank by brackets comprising a base piece 70 and brace arms 72, 74.

In the present application I, have not claimed the invention in its broadest aspects but broad claims to the invention have been incorporated in and allowed in my companion application" Serial Number 278,467, filed February 21, 1919.

lVhat I claim asnew is :-`I

entering said opening and for confining and` guidingYI said material to the .periphery of said body, and means carried bysaid body 1. A rotary mixer comprising a rotary` body having central receiving openings upon its opposite sides, means for establishing a centrifugalflow through said body of material entering said openings, and means for causing material which has entered the central opening upon each side to be discharged with a tendency to flow to the opposite `side of said body.

2. In combination with a liquid container, a tangential mixing wheel, stationary baffles about the periphery of. said wheel, and means for `directing upward a part of the material discharged by said wheel and for directing downward another part.

3. In combination with a vessel, a tangential mixing wheel, stationary baffles about the periphery of said wheel, and means carried by said wheel-'for directing upward a part of the material discharged by said wheel and for directing downward another part of said material.

4. A rotary mixer comprising a body rotatable about a vertical axis, said body having a 1 central opening extending therethrough, means for establishing a centrifugal How of material entering said central opening and for conlining and guiding said material to the periphery of said body, and

for directing upward a part of the material discharged at said periphery and for directing downward another part of said materia ,6. A rotary mixer comprising ay rotary body having central receiving openings upon its opposite sides, means for establishing a centrifugal flow through said body of material entering said openings, means for causing material which has entered the central opening upon each side to be discharged with a tendency to flow to the o-pposite side of said body, and means for checking the tangential movement of said4 discharged material.

7. A rotary Vmixer comprising a rotatable body, said body having a. central opening extending therethrough, means for establishing a centrifugal flow ythrough said body of material entering said opening, means where the peripheral tangential discharge of saidmaterial takes place for directing in one direction along the axis of rotation a part.

of the material discharged and for-directing in the other direction along said, axis another part of the discharged material, said directingmeans being alternately arranged about the axis of said rot-ary body to insure intermixing of material from the two sides of said body.

Signed at New York city, this 6th day of May 1916.

JOHN JOHNSON. Vitnesses EDWARD A. WIRTH, E. M. VAN AKEN. 

